Thermophysical Properties of Acetone or Methanol + n-Alkane (C9 to C12) Mixtures (original) (raw)
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Thermodynamic properties of the mixture acetone + methanol + n-octane at 25°C
2001
Mixing properties of the ternary mixture acetone + methanol + n-octane have been determined experimentally under standard conditions. Sound velocity, densities, and refractive indexes were measured as functions of composition. Excess molar volumes, changes of refractive indexes, and changes of isentropic compressibilities on mixing were computed from the experimental data. The Peng-Robinson and Soave-Redlich-Kwong equations of state were applied with three different mixing rules to correlate binary excess volumes and then to predict the excess magnitudes in ternary mixtures. Reliable representations of the experimental data were obtained.
Temperature influence on solution properties of ethanol + n-alkane mixtures
Journal of Molecular Liquids, 2007
This paper contains the results of a new experimental study of the effect of temperature on density, refractive index on mixing and ultrasonic velocity for a number of linear n-alkanes combined with ethanol. The experimentally derived functions were also compared with those predicted by different theoretical procedures. A qualitative analysis reveals that structure disruptions are predominant in ethanol + n-alkane mixtures. This effect is reinforced when the temperature or solute chain length rises. A perusal of deviations between the experimental and calculated derived magnitudes shows that the predictive procedures give a qualitative estimation for the studied mixtures due to their high nonideality. Disposable literature was compared and commented upon.
Liquid−Liquid Equilibria of Acetone + Methanol + n -Alkane (C 6 −C 8 ) at Different Temperatures
Journal of Chemical & Engineering Data, 2000
Liquid-liquid equilibria have been measured for the systems acetone + methanol + n-alkane (C 6-C 8) at 278.15, 288.15, and 298.15 K. Phase compositions were measured by gas chromatography from samples splitted isothermally in a glass stirred device. The tie line data were correlated with the UNIQUAC model and the corresponding fitting parameters being gathered. The UNIFAC group contribution method and its modifications were applied to test their capability to predict liquid-liquid equilibrium, only poor accuracy being obtained for these ternary systems.
Measurements of thermodynamic and transport properties have been effectively involved in understanding the nature of molecular interactions and physico-chemical behaviour in mixtures. As well as, they are necessary for the designing and optimizing of the industrial equipment. In this paper, experimental densities, ρ, viscosity, η, and refractive indices, n D , of binary mixtures of acetyl acetone (acac) with 1-butanol (Bu) were determined at temperatures of 298.15, 303.15 and 318.15 K and atmospheric pressure over the entire composition range of mixtures. The experimental values of mixtures and pure liquids have been used to calculate the excess volume, V E , deviation in viscosity, ∆η, excess Gibb's free energy of activation for viscous flow, ∆G * E , and deviation in molar refraction, ∆R. The computed results were fitted to the Redlich–Kister polynomial equation to evaluate the adjustable parameters (A i) and standard deviation (σ). The V E , ∆η and ∆G * E values of the mixtures have been found to be negative over the whole composition. The negative magnitude suggests the presence of strong intermolecular interaction between unlike molecules in the binary liquid mixtures. A comparative study of these properties together with those available in the literature has been also discussed.
Journal of Molecular Liquids, 2013
The experimental density, viscosity, and ultrasonic speeds of anisaldehyde (AA) and alkoxyethanols namely 2-methoxy ethanol (MOE), 2-ethoxy ethanol (EOE) and 2-butoxy ethanol (BOE) have been measured over the full range of compositions at atmospheric pressure and at different temperatures (303.15, 308.15, 313.15 and 318.15 K). From these experimental values the molar volume (Vm), adiabatic compressibility (βad) and intermolecular free length (L f), are computed and their excess properties along with deviation in viscosity (Δη) are fitted to Redlich-Kister type equation, a multi parametric nonlinear regression analysis technique to derive the binary coefficients and to estimate the standard deviation between experimental and calculated data. The experimental data of viscosity is also used to test the applicability of empirical relations of Grunberg-Nissan, Katti-Chaudhri, Heric-Brewer and Hind et al. for the systems studied. Further, FT IR analysis of these binary mixtures at different concentrations, confirms the presence of hydrogen bonding, and supported the results as observed in thermodynamic analysis with respect to forces of association/dispersion between unlike molecules. The interaction of AA with alkoxyethanol is found to decrease with increase in alkyl chain length of the alkoxy group.
International Journal of Engineering Research & Technology (IJERT), 2020
https://www.ijert.org/molecular-interaction-studies-on-binary-liquid-mixtures-of-ethyl-oleate-and-ethyl-methyl-ketone-at-temperature-range-from-30315k-to-31815k https://www.ijert.org/research/molecular-interaction-studies-on-binary-liquid-mixtures-of-ethyl-oleate-and-ethyl-methyl-ketone-at-temperature-range-from-30315k-to-31815k-IJERTV9IS040093.pdf Density (), ultrasonic velocities (u) and dynamic viscosity () for binary mixture of Ethyl oleate with Ethyl methyl ketone is experimented at ambient temperature range from 303.15K to 318.15K at atmospheric pressure over various compositions. The density () and viscosity () are calibrated using Specific gravity bottle and Ostwald's glass capillary viscometer respectively. The velocity (U) is measured using ultrasonic interferometer. The thermo dynamic parameters such as internal pressure (πi), free volume (Vf), Molar volume (Vm) and acoustical parameters such as adiabatic compressibility (β), inter molecular free length (Lf), acoustic impedance (z), relaxation time (τ) and their excess parameters have been calculated. INTRODUCTION In our earlier investigations, [1-2] we made an attempt by making use of an ultrasonic technique to explore the behavior of some of the amino acids as well as in organic liquid mixtures. In recent years much effort has been made with measurement and interpretation of the ultrasonic properties of liquids and liquid mixtures. The ultrasonic studies are of great importance in helping to understand the nature and extent of the patterns of molecular aggregation that exist in liquid mixtures, resulting from intermolecular interactions [3-4].There has been an increasing interest in the study of systems comprising of unlike components with interactions of varying type. The sign and magnitude of excess parameters have been used to investigate the interactions between the components of a system [5-7]. Molecular interactions are interactions between electrically neutral molecules or atoms. Other than atomic bonds these are electrical in nature and consist of attractive forces (orientation, induction, and dispersion forces) and repulsive forces. Molecular interaction first taken into consideration by J. D. van der Waals (1873) in explaining the properties of real gases and liquids. These depend on the distance between the molecules and usually are described by the potential energy of interaction. Studies on liquid-liquid mixtures either binary, ternary or more has importance of its own in various fields of con temporal civilized societies like chemical engineering, food processing, preparation of cosmetics, polymer paints and cleansing agents, petroleum, edible and non edible oil, preparation of bio diesel etc. Ultrasonic waves have their extensive applications in various fields like nondestructive tests for solids and liquids in medical and engineering, food processing, pharmaceutical, polymer and chemicals, metallurgical industries etc. It will be an advantageous tool if these two fields were combined for conducting studies on inter and intra particulate behavior. Ultrasonic investigations of binary mixtures have been taking place since decades by so many scholars under various heads like acoustic, thermodynamic, molecular interactions etc. The thermodynamic studies of binary liquid mixtures have attracted much attention of research scholars and scientists, and experimental data on number systems are available from review and publication [8-12]. Ultrasonic investigation of liquid mixtures consisting polar and non-polar components is of considerable importance in understanding intermolecular interaction between the component molecules and they find applications in a number of industrial and technological processes. Many investigations [13-18] have been employed in the task of collecting more and more data and explaining in terms of the properties of pure liquid. In the present paper the author submitting part of the studies as the effect of temperature and concentration on ultrasonic velocity(v) of 2MHz wave in the pure and mixtures of two organic liquids Ethyl Oleate and Ethyl Methyl Ketone at various temperatures 303.15K, 308.15K, 313.15K and 318.15K. The effects on density (ρ), viscosity (η), Adiabatic compressibility (βad), Inter molecular free length (Lf) and Internal pressure (Пi) also were studied. Results were tabulated and the relations among the mentioned parameters were represented as Graph.1-24.
Thermochimica Acta, 2005
The ternary systems 1,1-dimethylethoxy-butane (BTBE) + methanol + water and BTBE + ethanol + water have large heterogeneous zones. Experimental densities, refractive indices and speeds of sound have been measured at 298.15 K for mixtures of these systems within the homogeneous zone, and also for methanol + BTBE and ethanol + BTBE binary systems over the entire range of compositions. Excess molar volumes and molar refraction and isentropic compressibility changes of mixing were calculated from the experimental physical properties and were satisfactorily correlated with the corresponding composition data using the Redlich-Kister polynomial. Fitted coefficients and mean standard deviations of correlations have been reported.
International journal of applied thermodynamics, 2022
Experimental densities, viscosities, refractive indices, and sound speeds at temperature 298.15 K and atmospheric pressure are reported for the binary liquid mixtures of ethanol + benzene, ethanol + pyridine, and benzene + pyridine. From these experimental data, various thermodynamic excess and deviation properties were calculated and fitted by the Redlich-Kister polynomial to determine the adjustable coefficients and the standard deviations. The number of Redlich-Kister coefficients for significantly representing each thermodynamic property was optimized by applying the F-test. The variation of thermodynamic excess and deviation properties with composition has been interpreted in terms of molecular interactions between components of the mixture and structural effects. Furthermore, several theoretical and semi-empirical models were used to predict the refractive indices and sound speeds of the investigated mixtures. The predicting ability of each model was ascertained in terms of mean absolute percentage deviation between experimental and calculated data.
Thermophysical behaviour of the mixture (±)-3,7-dimethyl-1,6-octadien-3-ol with ethanol
Fluid Phase Equilibria, 2011
This paper reports the experimental values of density, speed of sound and refractive index of binary mixture of (±)-linalool + ethanol at four temperatures in the range of 283.15-328.15 K and 0.1 MPa. Excess molar volume, speed of sound deviation, refractive index deviation, molar refraction, molar refraction deviation and excess isentropic compressibility are also given at the same work conditions. Afterward, prediction of speed of sound and refractive index was carried out using several theoretical models or equations. The experimental density of the binary mixture was measured at high pressure between 20 and 40 MPa in the same range of temperature. Excess molar volume, isobaric thermal expansion, and isothermal compressibility were also calculated. Peng-Robinson (PR), Patel-Teja (PT), the Statistical Associating Fluid Theory (SAFT) and the Perturbed-Chain Statistical Associating Fluid Theory (PC-SAFT) were tested as predictive models of the P T behaviour. The best predictions were obtained with the PC-SAFT equation of state (EOS).